Liquid-fuel furnace



Oct. 19 1926.

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Patented Cct. 19, 1926.

H 1,603,492 UNITED STATES rrfrEn'r OFFICE.

OTTO OSWALD AND OTTO KRGER, OF HAMBURG, GERMANY.

LIQUID-FUEL FURNACE.

Application filed January 26, 1926, Serial No. 83,971, and in Germany January 14, 1925.

The invention relates to improvements in oil furnaces and its object is to combine simplicity of construction and operation with easy and line'regulation and to obtain great heating capacity even with inferior oils.

A further advantage of the improved oil furnace is that it may be adaptedd for any purpose and that it may becarried out from the smallest to the largest proportions and may also easily be installed in already existing furnaces. It is, furthermore, equally suitable for domestic as well as for industrial purposes, for heating the boilers of centr-al house heating installations as Well as of industrial plants, locomotives or ships.

The invention is diagrammatically illustrated by way of example in the accompanying drawing in which-f- Fig. 1 shows a side elevation, partly in cross-section, and

Fig. 2 a plan-view.

Like parts are indicated by like letters of reference in the iigures of the drawing.

The oil, which may be any heavy oil, is

- contained in a burner tray 1. This burner tray may possess any shape and size adapted to the purpose for which the furnace is to be applied and according'to the available space, in the present example the shape of a trough or gutter which instead of the converging shape may as a matter of course equally well'be of rectangular or round cross-section. Above the burner tray is disposed f a device by means of which compressed air in jets may be blown against the surface of the oil, said device consisting of a tube 2 which extends longitudinally above the trough 1 and in its bottom part is provided with perforations S'directed towards the burner tray `1. The tube 2 is 4fed from a source of compressed air of any suitable-- kind, for instance by a ventilator or blast 5 with which the tube 2 communicates by a pipe 4. The installation of the burner tray l and o f the compressed air tube '2 -depends upon the local conditions. In already existin furnaces, the burner tray andif desire a plurality of burner trays may be mounted on the grate of the furnace.

When the oil in the 'burner tray 1 is ignited, it burns at. the surface with short flames. As .soon as however'the compressed air is started and is blown from the openings 3Y of the .tube 2 in the Aform of jets large intensively aIiot nme is' produced which possesses a considerable heating capacity. pressed air, the ame and thus the furnace may be adjusted inthe simplest and finest manner according to the requirements for the time being.

The ignition of the oil in the burner tra l is preferably effected in such a manner t at upontheoil a layer of an easily inflammable liquid is put and this liquid is ignited. As such a liquid methylated spirit or alcohol is particularly suitab e.

By regulating the supply of com-l rlhe fuel burner tray 1 is formed by a cento which particularly the cheap'heavy oils are inclined is effectively avoided so that practically-any crude oil may be used in the improved furnace.

The cooling air may be directly discharged from the casing or jacke-t 10. It

may, however, also be entirely or partly employed as additional .air for the combustion.

For this purpose, the cover plate of the' jacket 10 is provided with perforations or slots 12 at the sides of thecentral trough 1 through which outlets the cooling air escapes in jets from the jacket or casing 10 and. enters into the flamev ser-ving as secondary air for assisting the combustion.

The level and the quantity of the liquid in the burner tray 1 is kept constant on the principle of communicating pipes by connecting it by means of the pipe-line 6 with the liquid fuel regulating tank 7 in which the level of the liquid fuel is kept constant by supplying the oil continuously to the regulating tank 7 and allowing it to over-Y flow all the time, avoiding by this means the usual swimmer tanks or automatic regulating valves which are not adapted 1 for the use ofcheap crude oils.

In the construction illustrated, an overflow tube 14 is vertically adjustable within the regulating tank 7 for the urpose of enabling, the level of 'the liquid) to be al-A tered. In the present case it may for example be-screwed more or less into thebottom of the. tank 7 The overflow., tube 14 could,

however, also be constructed as a smooth cylinder which may be moved up and down in the bottom of the tank 7 and be provided with a locking device of any known or suitable construction. With the object of obtaining a combined oil and coal furnace, pulverized coal may be added to the compressed air blown against the surface of the oil bath or to the secondary air blown into the flame or to both which coal is introduced either into vthe compressed air pipe 4: or the pipe 11. If the pulverized coal is to be added to the primary as well as to the secondary air, it may be directly introduced into the blast 5.

The parts and pipes employed in conjunction with the combustion process are :Eur-

nished with suitable control and stopping appliances of any known or suitable kind, not illustrated in the drawings, so that the combustion may be regulated and individual parts, such as the cooling air pipe,A may be cut out altogether.

- It will be readily understood that the del What we claim as our invention and desire to secure by LettersPatent is In a liquid fuel furnace in combination a casing, means for feeding air ,into sai casing, a central trough forming the burner tray in the cover plate of said casing, an air feeding tube with perforations in its bottom extending longitudinally above said central trough for blowing jets of air a ainst the trough, openings in the cover p ate 'of 'said oasin at the sides of said central trough allowing the air to be blown from said casing into the flame above the burner tray, and a fuel supply regulating tank communicating with said central trough. t

In testimony whereof We have affixed our signatures.

o'rTo oswALn. OTTO KROGER. 

